Video surveillance system carries the key video information records and emergency treatment of rail transit system, and replaces a large amount of manpower. The failure would cause confusion in the system or the loss of key information, raise huge risk on rail transportation. In the actual operation, the emergence of video surveillance system stability problems, affect the rail transit fault processing and the subway public security case. Therefore, the rail transit system put forward very strict requirements on the reliability of the video surveillance system. As the key part in high-definition video network transmission, the transmission mode and transmission technology of Transmission system seriously influence the reliability of the whole system.
Based on the Bucket Theory, the ending picture quality will depend on the worst part of the whole system; and the worst part is usually the high-definition network transmission system. It is necessary for people to choose appropriate network high-definition transmission method, high-quality network high-definition transmission cables and equipments, and then according to the practical needs to install it professionally, so as to reach perfect network high-definition transmission.
With the development of the fiber optical communication, there are more and more ways of the high-definition picture network transmission. Compared to the twisted-pair network high-definition transmission and the coaxial-cable network high-definition transmission, optical transceiver network high-definition transmission of video signal superposition and signal multiplexer has more advantages on it. It is well known that the optical fiber network high-definition transmission firstly is based on the optical transceiver, transfer the electrical signal multiplexer to the optical signal multiplexer from one side of the fiber(cable), and transfer the light signal multiplexer back to corresponding electrical signal multiplexer from the other side. Optical transceiver provides high-definition transmission surveillance system with sensitive network high-definition transmission and networking method. Thus the signal multiplexers are of good quality, high stability.
In recent years, the rapid development of optical fiber communication skills makes the price of optical fiber network high-definition transmission surveillance system fell sharply. So the application of the optical fiber and optical transceiver in the high-definition transmission control system is more and more popular. Optical fiber has been widely used in family fiber and unit access network, such as smart home, office automation, industrial control network high-definition transmitter, vehicle onboard and military communication network, etc.. As for high-definition video signal superposition which requires the network high-definition transmission bandwidth and network high-definition transmission interval, the arrival of the optical fibers makes high-definition transmission control come true.
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